ZHEJIANG KAYO MOTOR CO., LTD.
WWW.KAYOMOTO.COM
66
Carbon
deposit
on
working surface
It is impossible to fit the
valve and the valve seat
tightly.
The engine starts hard or fails to
start. Insufficient engine output;
Engine speed changes during idle
run
Remove the carbon
deposit
The working surface is over
worn or has pits, pock
marks, ablation or damage
It is impossible to fit the
valve and the valve seat
tightly.
The engine starts hard or fails to
start. Insufficient engine output;
Engine speed changes during idle
run
Replace the valve
The valve stem is over worn
The
fitting
clearance
between the valve stem and
the valve
guide
is too
wide
Sound of valve leakage, Thick
blue and white fume form the
exhaust muffler pipe
Replace the valve
The valve
stem
is
deformed
It is impossible to close the
valve completely
The engine starts hard or fails to
star
Replace the valve
Valve
spring
The
spring
is
ineffective or fractured
It is impossible to fit the
valve and the valve seat
tightly.
The engine starts hard or fails to
star. Sound of the cylinder head
Replace
the valve
spring
